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公开(公告)号：US3751596A
公开(公告)日：1973-08-07
申请号：US3751596D
申请日：1971-11-29
Applicant: IBM
Inventor： TSENG S
CPC classification number: H04J15/00
Abstract: A data transmission system for transmitting information over a plurality of channels or for multiplexing different information on a single channel is described. The system includes a transmitting station where input data signals are linearly transformed into a complementary pulse sequence and transmitted to a receiving station wherein the transmitted pulses are inversely transformed to recover the original signals. The recovered signals are larger in amplitude than the original input signals by a factor dependent on the number of information channels in the system. Any noise introduced during transmission is not made larger in amplitude with the result that the signal to noise ratio of the received signals is improved. The input signals are supplied to a plurality of encoding devices at the transmitter. The encoding devices include tapped delay line devices having multipliers at the taps that multiply the tapped signals by a plus or minus factor in accordance with the code. The multiplied signals are then combined to produce a pulse sequence which is transmitted to the receiving station. At the receiving station the pulse sequence is applied to a plurality of decoding devices. The decoding devices include tapped delay line devices having multipliers at the taps which multiply the tapped signals by a plus or minus factor according to a code which is complementary to the code used at the transmitting station. The multiplied signals are then combined to recover the original input signal which is increased in amplitude by a given factor. The system may be embodied in acoustic surface wave structures wherein the encoding and decoding devices are interdigital transducers.
Abstract translation: 描述了用于在多个信道上发送信息或在单个信道上复用不同信息的数据传输系统。 该系统包括发送站，其中输入数据信号被线性变换成互补脉冲序列，并发送到接收站，其中所发射的脉冲被逆变换以恢复原始信号。 恢复的信号的幅度比原始输入信号的幅度要大，取决于系统中信息通道的数量。 在传输期间引入的任何噪声的幅度都不会变大，从而提高了接收信号的信噪比。 输入信号被提供给发射机处的多个编码装置。 编码装置包括抽头延迟线装置，其在抽头处具有乘法器，根据代码将抽头信号乘以正或负因子。 然后将相乘的信号组合以产生被发送到接收站的脉冲序列。 在接收站，脉冲序列被应用于多个解码装置。 解码装置包括抽头延迟线装置，其具有在抽头处的乘法器，根据与发送站使用的代码互补的代码将抽头信号乘以加或减系数。 然后将相乘的信号组合以恢复以给定因子增加振幅的原始输入信号。 该系统可以体现在声表面波结构中，其中编码和解码装置是叉指式换能器。
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公开(公告)号：CA930437A
公开(公告)日：1973-07-17
申请号：CA113590
申请日：1971-05-21
Applicant: IBM
Inventor： TSENG S , SADAGOPAN VARADACHARI , LEAN E
Abstract: An integrated acoustic surface wave device is provided by this disclosure wherein a piezoelectric field associated with an acoustic surface wave causes a material adjacent to the surface to transform from one physical state to another physical state. The changes in state due to the presence of the piezoelectric wave are utilized to detect, amplify and store information. The presence of the piezoelectric wave controls external physical quantities, e.g., voltage and current, for information processing and storage. In particular, an amorphous semiconducting material is deposited on the surface of a piezoelectric surface wave acoustic delay line at a location where the presence of the traversing piezoelectric wave is to be detected. Contact electrodes are provided on the amorphous material and are connected to an external electrical circuit wherein there is a voltage source and a load means. The voltage source provides an electric field in the amorphous material of a value below that necessary to achieve the threshold value for switching the material from a high-voltage and low-current state to a high-current and low-voltage state. In this manner, the piezoelectric field of the acoustic surface wave which transiently appears at the amorphous material when added to the externally applied electric field causes it to switch states and thereby gives rise to a pulse indication in the external electrical circuit.
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公开(公告)号：SE367525B
公开(公告)日：1974-05-27
申请号：SE845071
申请日：1971-06-30
Applicant: IBM
Inventor： LEAN E , SADAGOPAN V , TSENG S
Abstract: An integrated acoustic surface wave device is provided by this disclosure wherein a piezoelectric field associated with an acoustic surface wave causes a material adjacent to the surface to transform from one physical state to another physical state. The changes in state due to the presence of the piezoelectric wave are utilized to detect, amplify and store information. The presence of the piezoelectric wave controls external physical quantities, e.g., voltage and current, for information processing and storage. In particular, an amorphous semiconducting material is deposited on the surface of a piezoelectric surface wave acoustic delay line at a location where the presence of the traversing piezoelectric wave is to be detected. Contact electrodes are provided on the amorphous material and are connected to an external electrical circuit wherein there is a voltage source and a load means. The voltage source provides an electric field in the amorphous material of a value below that necessary to achieve the threshold value for switching the material from a high-voltage and low-current state to a high-current and low-voltage state. In this manner, the piezoelectric field of the acoustic surface wave which transiently appears at the amorphous material when added to the externally applied electric field causes it to switch states and thereby gives rise to a pulse indication in the external electrical circuit.
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